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input: i8042: Provide feature to disable keyboard before booting kernel

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The BIOS leaves the keyboard enabled during boot time so that any
keystroke would interfere kernel driver initialization.

Add a way to disable the keyboard to make sure no scancode will be
generated during the boot time. Note that the keyboard will be
re-enabled again after the kernel driver is up.

This code can be called from the board functions.
Signed-off-by: Louis Yung-Chieh Lo <yjlou@chromium.org>

Signed-off-by: Louis Yung-Chieh Lo <yjlou@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Rini <trini@ti.com>
This commit is contained in:
Louis Yung-Chieh Lo
2012-10-11 15:15:51 +00:00
committed by Tom Rini
parent 48edb304d0
commit 45fe668f5f
2 changed files with 51 additions and 0 deletions
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13
include/i8042.h
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@@ -75,6 +75,19 @@ enum {
/* exports */
/**
* Flush all buffer from keyboard controller to host.
*/
void i8042_flush(void);
/**
* Disables the keyboard so that key strokes no longer generate scancodes to
* the host.
*
* @return 0 if ok, -1 if keyboard input was found while disabling
*/
int i8042_disable(void);
int i8042_kbd_init(void);
int i8042_tstc(void);
int i8042_getc(void);